（x+y)²-4（x+y-1）
（x²+y²）²-4x²y²
（x²+2x)²+2(x²+2x)+1
a²-b²-2a+1
9-6a-6b+a²+2ab+b²
人气：123 ℃ 时间：2020-06-02 22:17:46
解答
第一道=(x+y)²-4(x+y)+4=(x+y-2)²第2道=(x²+y²)²-(2xy)²=(x²+y²+2xy)*(x²+y²-2xy)=(x+y)²*(x-y)²第3道把x²+2x看成整体=(x²+2x+1)²第4...
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